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<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=654137
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<head>
  <title>Test for Bug 654137</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=654137">Mozilla Bug 654137</a>
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<pre id="test">
<script type="application/javascript">
/** Test for Bug 654137 **/
var prev = window.top;
top = "Fail";
is(top, prev, "top should not have been replaced");
</script>
</pre>
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